Model: 8157901

Thumbscrew

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.203 inches and 0.234 inches

Fastener Length

Between 0.703 inches and 0.734 inches

Head Style

Knurled no. 1

Head Diameter

Between 0.734 inches and 0.766 inches

Head Height

Between 0.234 inches and 0.266 inches

Shoulder Diameter

0.375 inches first shoulder

Shoulder Length

0.125 inches first shoulder

First Diameter From Head

Between 0.182 inches and 0.187 inches

Distance From Largest Bearing Surface Of Head To End Of First Diameter

Between 0.484 inches and 0.516 inches

Point Style

Flat

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Externally Relieved Body Diameter Quantity

Shoulder Shape

Round first shoulder

Material

Steel comp 303

Material Specification

Qq-s-764 cond a federal specification single material response

Surface Treatment

Passivate

Surface Treatment Specification

171, finish no. 5.4.1 military standard single treatment response

Thread Series Designator

Unc

NSN

5305-00-721-8346

Part Number

8157901

Description

Thumbscrew

CAGE

18876

An externally threaded fastener whose threaded portion is of one nominal diameter. It may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. It has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. For items having wrenching facilities such as socket recess, multiple spline or slot heads, use screw (as modified) or bolt (as modified).

Part 8157901 NSN 5305-00-721-8346

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

06673

FIIG:

A003B0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318152000
SITC: 69421
End Use: Iron and steel products, other
NAICS: 332722
USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment